input-file-spec

    Specifies the names of one or more files whose specifications are
    to be changed.

    You can use wildcard characters in the file name and file type
    specification; if you do, all files that satisfy the specified
    fields are renamed.

 output-file-spec

    Provides the new file specification to be applied to the input
    file. The RENAME command uses the file name and file type of the
    input file specification to provide defaults for nonspecified
    fields in the output file.

    You can specify an asterisk (*)  in place of the file name
    or file type of the output file; the RENAME command uses the
    corresponding field in the input file specification to name the
    output file. Specifying wildcard characters in corresponding
    fields of the input and output file specifications results in
    multiple rename operations.

    You can omit the device name from the output specification.
    EXCHANGE uses the device name specified for the input, since
    it is not possible to rename a file from one device to another.